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You can not run this command from a rescue system.
When you start the rescue system your server will not be booted regularly.
It is just another OS where your filesystem is mounted under /repair.
So you can change files in the file system, but you cannot run commands in your system.
I had the same problem with no SSH access.
I booted a rescue system and did the following things.
Fix Plesk
Edit the file /repair/etc/crontab and add the following line at the end.
@Reboot root chown root:lock-manager /run/lock/lmlib && chmod -R 0770 /run/lock/lmlib
Fix SSH
Edit the file...
Do you have any information, what your VPS did to make ssh work again?
I am stucked with the same problems.
I was able to solve the issue with Plesk with the described workaround:
Plesk is not accessible: Can't open or create shared memory by shm.name
But I had to do it via rescue system...